I did https://radio-hn.pages.dev/ last year in the same idea, just once per day. Posted it somewhere here at the time.
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Is the code for this available? I'm particularly curious how you did the multiple speakers and voices.
NotebookLM has the issue that they keep switching sides, like one will be the student and the other the teacher on a subject, but then they'll suddenly switch in a way that makes no sense.
You collect N links from HN api with any heuristic you want, then scrape those urls - preferably using pupeteer-based tooling or online equivalent (think Jina).
I then ran each url's content in an LLM to get a summary, then from all the results ask a LLM to create the conversation (and give it a tone). Then decide on the voices and characters and feed each turn into 11labs (or any tts). And finally, concatenate all audio parts, add music and effects.
If I remember correctly, mine could perform all that from a single Cloudflare worker. The catch is it can become a bit pricey because of the TTS. I remember toying with making it a product (podcast everything) and quickly discovered there's a couple of company already offering this.
NotebookLM is slightly different on the TTS front, I think they are using the amazing model google showed off a year or so ago (without giving it public access) that can generate actual multi speakers conversations with "hums" and cutting, and talking at the same time.
Added : someone just made a python lib for the usecase (also found on HN 5 days ago) https://github.com/souzatharsis/podcastfy